Rails 4, Mailer preview, preview attached images

Question

I have problem with rails 4.1.6 mailer preview.

I want to see attached images in preview mode, but it doesn\'t work. I think it\'s incorrect

There is my code:

Answer 1

Until the Rails mail previewer is enhanced to support attachment viewing, I'm using this (hack-ish) enhancement to Mail::Part#url to embed the attachment data into the URL itself. This lets see my inline images in the previewer (assuming I have INLINE_MAIL_PART_URLS turned on) while preserving the original behaviour in the appropriate settings.

module InlineMailPartUrls
  def url
    if ENV["INLINE_MAIL_PART_URLS"] == "true"
      "data:#{mime_type};base64,#{Base64.encode64(body.decoded)}"
    else
      super
    end
  end
end

class Mail::Part
  prepend InlineMailPartUrls
end

I save this code to config/initializers/inline_mail_part_urls.

https://gist.github.com/softcraft-development/2ed70a2a4d6e2c829fac